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AAT3166

AAT
Part Number AAT3166
Manufacturer AAT
Description High Efficiency 1X/1.5X/2X Charge Pump
Published Apr 30, 2007
Detailed Description High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications General Description The AAT3166 is a low noise, consta...
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AAT3166
AAT3166

Overview
High Efficiency 1X/1.
5X/2X Charge Pump for White LED Applications General Description The AAT3166 is a low noise, constant frequency charge pump DC/DC converter that uses a trimode load switch (1X), fractional (1.
5X), and doubling (2X) conversion to maximize efficiency for white LED applications.
The AAT3166 is capable of driving four LEDs for a total of 108mA from a 2.
7V to 5.
5V input.
The current sinks may be operated individually or in parallel for driving higher-current LEDs.
A low external parts count (two 1µF flying capacitors and two small 1µF capacitors at IN and OUTCP) make this part ideally suited for small, battery-powered applications.
AnalogicTech's AS2Cwire™ (Advanced Simple Serial Control™) serial digital input is used to enable, disable, and set current for each LED with a 16-level logarithmic scale plus four low-current settings down to 115µA.
For optimized efficiency, low-current settings require only 50µA of housekeeping current.
AAT3166 Features • • ChargePump™ • • • • • • • • • • • VIN Range: 2.
7V to 5.
5V Fully Programmable Current with Single Wire — 16-Step Logarithmic Scale — 14/18/27mA Max Current — Four Low-Current Settings Down to 115µA — Low IQ (50µA) for Single-Channel, LowCurrent Mode Tri-Mode 1X, 1.
5X, 2X Charge Pump for Maximum Efficiency and VF Coverage Drives Up to Four LEDs Individual Main-Sub (3-1) Group Control No Inductors, Low Noise Operation 1MHz Constant Switching Frequency Small Application Circuit Built-In Thermal Protection Built-In Auto-Disable for Open Circuit Automatic Soft Start IQ <1uA in Shutdown TDFN33-12 Package Each output of the AAT3166 is equipped with builtin protection for output short-circuit and auto-disable for load short-circuit condition.
Built-in softwww.
DataSheet4U.
com start circuitry prevents excessive inrush current Applications during start-up.
A low-current shutdown feature disconnects the load from the input and reduces qui• Color (RGB) Lighting escent current to less than 1µA.
• Programmable ...


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